Force usage of virThreadCreate

We want all threads to be set as workers or to have a job assigned to
them, which can easily be achieved in virThreadCreate wrapper to
pthread_create. Let's make sure we always use the wrapper.

Signed-off-by: Jiri Denemark <jdenemar@redhat.com>

cfg.mk

@@ -999,6 +999,12 @@ sc_prohibit_sysconf_pagesize:
 	halt='use virGetSystemPageSize[KB] instead of sysconf(_SC_PAGESIZE)' \
 	  $(_sc_search_regexp)
 
+sc_prohibit_pthread_create:
+	@prohibit='\bpthread_create\b' \
+	exclude='sc_prohibit_pthread_create' \
+	halt="avoid using 'pthread_create', use 'virThreadCreate' instead" \
+	  $(_sc_search_regexp)
+
 # We don't use this feature of maint.mk.
 prev_version_file = /dev/null
 
@@ -1192,3 +1198,6 @@ exclude_file_name_regexp--sc_prohibit_virXXXFree = \
 
 exclude_file_name_regexp--sc_prohibit_sysconf_pagesize = \
   ^(cfg\.mk|src/util/virutil\.c)$$
+
+exclude_file_name_regexp--sc_prohibit_pthread_create = \
+  ^(cfg\.mk|src/util/virthread\.c|tests/.*)$$